7 March 2013 Sharp focus light simulation in a planar gradient secant lens
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The simulation of light focusing by a gradient, secant-plane lens was performed. The simulation using a finite-difference time-domain method shows that by combining the gradient-index hyperbolic secant (HS) lens with a subwavelength diffraction grating or by replacing the lens with its binary analog, the focal spot size can be reduced by 10% and 20%, respectively, with respect to the diffraction-limited resolution in the two-dimensional medium. We design a planar, binary-silicon HS microlens that generates a near-surface focal spot with a full-width, half-maximum diameter equal to 0.102λ and almost without sidelobes. It is shown that about 10% of the incident beam total power goes to the far-field zone.
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Anton G. Nalimov, Anton G. Nalimov, Viktor V. Kotlyar, Viktor V. Kotlyar, Alexander A. Kovalev, Alexander A. Kovalev, } "Sharp focus light simulation in a planar gradient secant lens," Optical Engineering 52(9), 091705 (7 March 2013). https://doi.org/10.1117/1.OE.52.9.091705 . Submission:

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